Indeed the real world investing is something safer and more promising than have to make investments in a world full of uncertainty. However it is very likely succeeded at bitcoin, because I see the future of the bitcoin is very special. You could try business online store, or do the mining
It would be way safer to have a business in practical world than having it online but still if someone wants to do it he could possible create some casino or exchange website which are almost most running websites these days around bitcoin.
If we are talking about bitcoin in casinos that would be nice idea but if in real world it is not really worth to try. Also in Online selling or online shop that is also nice right now which is you have a both payment method on bitcoin and your own fiat. Just make it cool so that it will click